Patents by Inventor Yasunobu Kai

Yasunobu Kai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • 3-propenylcephem derivative
    Patent number: 4921850
    Abstract: A 3-propenylcephem derivative of the following formula: ##STR1## wherein R.sub.1 represents a fluoro-substituted lower alkyl group or a cyano-substituted lower alkyl group, and A represents a cyclic or an acylic ammonio group, or a pharmaceutically acceptable salt thereof, exhibiting excellent anti-bacterial activities against both Gram-positive bacteria and Gram-negative bacteria; Process for the preparation thereof; Anti-bacterial composition; Intermediate for the 3-propenylcephem derivative; and Process for the preparation of the intermediate.
    Type: Grant
    Filed: October 13, 1987
    Date of Patent: May 1, 1990
    Assignee: Eisai Co., Ltd.
    Inventors: Takashi Kamiya, Toshihiko Naito, Shigeto Negi, Yuuki Komatu, Yasunobu Kai, Takaharu Nakamura, Isao Sugiyama, Yoshimasa Machida, Seiichiro Nomoto, Kyosuke Kitoh, Kanemasa Katsu, Hiroshi Yamauchi